//
// NullableStringValidator.cs
//
// Authors:
//  Atsushi Enomoto (atsushi@ximian.com)
//  Lluis Sanchez Gual (lluis@novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// copied StringValidator.cs and changed class name and just one line 
// in Validate() (see there).

#if (NET_2_0 || NET_2_3_5 || NET_3_5)

namespace System.Configuration
{

	internal class NullableStringValidator : ConfigurationValidatorBase
	{
		Char[] invalidCharacters;
		Int32 maxLength;
		Int32 minLength;

		public NullableStringValidator(Int32 minLength)
		{
			this.minLength = minLength;
			maxLength = Int32.MaxValue;
		}

		public NullableStringValidator(Int32 minLength, Int32 maxLength)
		{
			this.minLength = minLength;
			this.maxLength = maxLength;
		}

		public NullableStringValidator(Int32 minLength, Int32 maxLength, String invalidCharacters)
		{
			this.minLength = minLength;
			this.maxLength = maxLength;
			if (invalidCharacters != null)
				this.invalidCharacters = invalidCharacters.ToCharArray();
		}

		public override Boolean CanValidate(Type type)
		{
			return type == typeof(String);
		}

		public override void Validate(object value)
		{
			// This is the only difference from StringValidator:
			// null value is always allowed.
			if (value == null)
				return;
			String s = (String)value;
			if (s == null || s.Length < minLength)
				throw new ArgumentException("The String must be at least " + minLength + " characters Int64.");
			if (s.Length > maxLength)
				throw new ArgumentException("The String must be no more than " + maxLength + " characters Int64.");
			if (invalidCharacters != null)
			{
				Int32 i = s.IndexOfAny(invalidCharacters);
				if (i != -1)
					throw new ArgumentException(String.Format("The String cannot contain any of the following characters: '{0}'.", invalidCharacters));
			}
		}
	}
}
#endif
